I don't usually think about that question when
doing experiments, but
Wikipedia says the dependent variable is the one
that is being tested.
and independent variables
You're testing plant growth, so that's the
dependent variable. You're
changing the type of light, so that's the
Wikipedia has a nice paragraph about that, for
an experiment about
whether fertilizer helps plants grow.
Effect of fertilizer on plant growth
In a study measuring the influence of different
fertilizer on plant growth, the independent
variable would be the
amount of fertilizer used. The dependent variable
would be the growth
in height or mass of the plant. The controlled
variables would be the
type of plant, the type of fertilizer, the amount
of sunlight the
plant gets, the size of the pots, etc.
Keep asking questions!
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